Search

Pt[(P[Ph.sub.3]).sub.4] has catalyzed intramolecular vinylthiolation and -selenation of internal alkynes with vinyl chalcogenides having a carbamoyl group on the cis-[beta]-position of the vinyl moiety, thus giving rise to the highly conjugated [delta]-lactam frameworks. The alkyne insertion processes has shown that the formation of seven-membered platinacycle is kinetically favored and the introduction of electron withdrawing groups to [beta]-position on vinyl moiety is vital for developing new type of catalytic reaction by using vinyl heteroatom compounds.

Pd catalyzes intramolecular selenocarbamoylation of alkynes is discovered to give alpha-alkylidenelactams. The possibility of selenocarbamoylation is examined by reacting a carbamoselenoate, PhSe-C(O)-NMe2, with an alkyne.